Phase-locked loop circuit with charge pump noise cancellation

Details Phase-locked loop circuit with charge pump noise cancellation Phase-locked loop circuit with charge pump noise cancellation

1998-10-09

2000-08-29

Kinkead, Arnold

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 1A, 331 25, 327536, 327156, 327157, H03L 7089

Patent

active

061114707

ABSTRACT:
The switching time of a phase-locked loop (PLL) circuit can be reduced by increasing circuit bandwidth. A charge pump system is commonly used in the PLL circuitry to drive the voltage control oscillator (VCO). The increase in bandwidth intensifies the noise that is contributed by the charge pump system. To reduce charge pump noise, a chopper stabilizer circuit modulates the noise to a sufficiently high frequency so that a low-pass filter may filter out the modulated noise.

REFERENCES:
patent: 5465061 (1995-11-01), DuFour
patent: 5485125 (1996-01-01), DuFour
patent: 5703511 (1997-12-01), Okamoto
"A 300-MHZ BiCMOS Serial Data Transceiver", IEEE Journal SC29, No. 3, Mar. 1994, p. 185-192.

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